Test Technologies Contributing to Electrification - 4. Virtual–Real, Simulator–Test Technology for Optimizing Electric Powertrain Performance Without Using an Actual VehicleFig. 2: Overview of VRS test systemFig. 3 Comparison between PT-VRS and ENG-VRS systemsFig. 4 Exhaust catalyst temperature distribution control systemFig. 5 Overview of thermal management test system2.3 Overview of thermal management test52falls below a certain predetermined value, and the motor for power generation starts the engine. Conversely, the engine is instructed to stop when the battery capacity exceeds a predetermined value, and the motor for power generation stops the engine. Fig. 3 shows a comparison between the PT-VRS test system, in which an entire powertrain (PT) system is mounted on a test bench, and the ENG-VRS test system, in which only an engine (ENG) is mounted. In the PT-VRS used for the evaluation of the e-POWER system, the engine and motor for power generation, motor for driving, inverter, and decelerator are installed on the test bench. In the ENG-VRS system, the engine for power generation is installed on the test bench, but the motor for power generation, motor for driving, and inverter are replaced by a model.In the VRS tests, it is very important to reproduce the temperature condition of the powertrain for simulating the vehicle driving conditions. Fig 4 shows a system that reproduces the exhaust treatment catalyst of a vehicle running on the ENG-VRS test bench. A fan with a variable flow rate is installed to change the airflow rate, which is adjusted to the vehicle speed during the vehicle driving simulation test. This causes the ambient flow volume around the exhaust aftertreatment catalyst to be equivalent to that of the actual temperature distribution around the exhaust aftertreatment catalyst becomes equivalent to that of the actual vehicle.A test system was constructed to actively control the oil and water temperatures of the engine in the bench test system such that the temperature condition in the test system approached that of the actual vehicle. Fig. 5 shows the test thermal management system. The system includes a controller (2) that controls the oil and water temperatures and model analysis systems (3) and (4) that reproduce the oil and water temperatures of a running vehicle.the temperature around vehicle. Consequently, the
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